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Cyanfish · Answer 1 · 2018-05-11T16:09:07+0000

$\pi r^(2) (h)/(3)$ is the volume of a cone.
the volume of the cone is
$27 \pi$

$\pi r^(2) h$ is the volume of a cylinder
the volume of the cylinder is
$81 \pi$

$81 \pi - 27 \pi = 54 \pi$ which is the volume of the shaded region

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